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- 2 Sheets-Sheet 1. E. A. WILDT.

PISTON VALVE.

(No Model.)

Patented Oct. 10, 1882..

WITNESSES wig? A H W M fij if 2 Sheets'-Sheet 2. E. A. WILDT.

"PISTON VALVE.

-(No Model.)

' Patented Oct. 10, 1882.

INVENTOZ ATTORNEY riiiumlllll WmnlIll!mllmlll'llllllllllm mull!!!WITNESSES: dffli f I UNlTED STATES EDWARD A. WILDT, OF LOFG ISLAND CITY,NEV YORK.

PISTON-VALVE.

SPECIFICATION forming part of Letters Patent No. 265,727, dated October10, 1882.

Application filed July 29, 1882. (No model.)

To all whom it may concern Be it known that I, EDWARD A. WILDT, of LongIsland City, in the county of Queens and State of New York, haveinvented certain newand useful Improvements in Valves, of which thefollowing is a specification.

This invention has reference to certain improvements inpiston-valves,whereby steam valve, and mechanism by which a shifting motion issimultaneously imparted to the valve, so as to give increased space tothe exhaust by means of enlarged cavities in the valve; and theinvention consists, secondly. of certain details of construction, whichwill hereinafter be more fully described.

In the accompanying drawings, Figures 1 and 2 represent verticallongitudinal sections of one form of my improved valve, to which,simultaneously with the reciprocating motion, a rotary shifting motionaround its axis isimparted. Fig. 3 is a vertical transverse section ofthe same on line 00 50,-Fig. 1. Fig.4 is a vertical, longitudinalsection of a moditied construction of the valve shown in Fig. 1., with adifferent arrangement of the steam admission and exhaust edges. Fig. 5is a vertical longitudinal section of a steam-cylinder with my improvedvalve shown in-conn'ection with the mechanism by which rotary shiftingmotion is imparted to the slide-valve; and Figs. 6, 7, 8, 9, and 10 showthe application of the same principle to common flat slide-valves towhich simultaneously a reciprocating and a shifting motion is imparted.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents a steam-cylinder with suitablesteam supply and exhaust p0rts,'B the valve-chest, and. G theslide-valve. The slide-valve O is preferably made in the shape of apiston-valve, the cage orchestB being cylindrical, open at both ends,and provided at the top with a steam-supply passage, 1), having twoopenings, b b, so as to supply steam to both ends of the piston-valve,

and thereby balance the same. The bottom part of the valve-chest B haslateral ports dd, which communicate with the steam supply and exhaustports of the c \'linder A. The pistonvalve 0 is provided withtightly-packed pistons O at both ends and intermediately between thepistons with collars 0 one half of which is thicker than the other halfof the collar the thicker half of each collar facing the thinner half ofthe other collar. A tubular valve-stem, passes centrally through theparts of the piston-valve and forms part of the connecting-rod, operatedby the eccentric on the drivingshaft. Simultaneously with thereciprocating motion .imparted by the eccentric, the piston-valve 0receives either a rotary reciprocating or preferably a continuous rotarymotion by a suitable mechanism, one complete revolution being made forevery fnllretolntion ofthe main shaft of the steamengine. 1

The mechanism by which rotary motion is imparted to the piston-valve Gis shown in Fig. 5, and consists of a square portion, 0, of theconnecting-rod, which square portion carries a loosely-sliding piston,c, that is engaged by a flanged and toothed segment, 6 keyed to aspirally-bent r0(l,e that turns in suitable bearings, 6 The cross-headof the piston-rod of the steam-cylinder carries a lixed nut, f, theopening of which corresponds to the crosssection of the spirally-bentrod, so that with each reciprocation of the piston the spirallybent rodis turned, the toothed segment oscillated, and thepinion e rotated,while the connecting-rod 0 moves in the hole of the pinion, as this isretained by the side flanges of the segment 6 The piston-valveO receivesthus a rotary motion simultaneously with its reciprocating motion. Inplace of the mechanism shown, any other mechanism by which the sameobject is accomplished may be used, as I do not confine myself to thespecific construction shown. The thicker halt of the collars (J of theslide-valve G has to be made equal in width to the width of the portplus the lap, while the thinner portion has to be equal to the width ofthe port. Whenever the thinner portion of one of the collars O is placedby the rotary motion of the valve 0 over one port and the thickerportion of the other collar over collars (J to the exhaust-port d.

the other steam-port, admission will take place at the former andexhaust at the other port. Supposing the valve to be moving in thedirection of the arrows in Figs. 1, 3, and 5, the steam enters at oneport, which is also about to be closed to the exhaust, and at the sametime opens the other port to the exhaust-port d. As the piston-valve Ois simultaneously turned around its axis by the mechanism described, andas the ports (I are extended upward, so as to terminate midway betweenthe top and bottom of the cylindrical chest or cage B, as shown clearlyin Figs. 1, 2, and 3, exhaust takes also place at one of the lateraledges 07. of the thicker portion of the left-hand collar O ,so that bythe combined forward and rotary motion of the piston-valve O the area ofthe port through which steam escapes is gradually increased, andconsequently the steam exhausted freely and without obstruction throughthe annular cavity between the The large space furnished in this mannerto the exhauststeam dispenses entirely with the too early opening of theexhaust, and also with the too early closing of the same, and overcomesthereby in effective manner one of the main 0bjec tions to the commonslide-valves. The same operation takes place when the valve is travelingin opposite direction, as in Fig. 2, in which case the exhaust takesplace at the lateral edge (1 of the right-hand collar 0 and at the inneredge of the thicker portion, the ex haust-opening increasing graduallyas the piston-valve moves in the direction of the arrow.

In case the relative location of the steam-- supply and exhaust ports isarranged as in Fig. 4 the thicker portions of the collars (J arearranged at the outside of the collars, while in the piston-valve shownin Figs. 1 and 2 they are placed at the inside of the collars. The sameprinciple may also be applied to the common flatslide-valves,in whichcase thevalve is made double the width of the valve-seat, so that alateral shifting motion can be imparted thereto simultaneously with itsreciprocating motion by any suitable mechanism, thus bringing one of theenlarged cavities over the port, and facilitate the exhaust at two edgesof the valve, in an analogous manner as before described in the rotarypiston -valve. As the valve receives the reciprocating and lateralmotion at the same time, a diagonal motion is the result, as shown inFig. 6, whereby the enlarged cavity is brought gradually over thesteamport, and thereby the area of exhaust gradually increased.

The valve may also be made of round or disk valve has thicker andthinner lips, which, when presented to the steam-ports, facilitatethereby the exhaust, owing to the increasing area of theexhaust-passage.

The principle in all the different applications and modifications of myvalves is the same-to wit, to facilitate the exhaust by permitting theadmission of steam at one port and the exhaust at the other port to takeplace simultaneously, and then gradually enlarging the area of theexhaust-opening, so that the most favorable conditions of steamadmission and exhaust relatively to the position of the enginepiston isthe result.

Having thus described my invention, I claim as new and desire tosecureby Letters Patent- 1. Thecombination of a valve-chest havingsteam-passages, a reciprocating slide-valve having thicker and thinnerportions opposite each other, and mechanism whereby simultaneously withthe reciprocating motion a shifting motion is imparted to the valve, soas to gradually enlarge the exhaust-opening for the free exit of theexhaust-steam, substantially as set forth.

2. A piston-valve having recessed collars, the thick and thin portionsarranged relatively to each other, as shown, at opposite sides of thesteam and exhaust cavity, substantially as described.

3. The combination of a valve chest or cylinder, B, havingsteam-supply.passages b and d, with a reciprocating piston-valve, 0,having recessed collars O, the thicker halves of which are opposite thethinner halves, and an intermediate annular exhaust-cavity,substantially EDWARD A. WILDT.

Witnesses:

PAUL GoEPaL, SIDNEY MANN.

IIO

